State logic

A State logic control system is a programming method created for programmable logic controllers.

A state logic control system uses a State diagram as a model of reality, thus using the fundamentals of finite state machine theory as the basis of a programming language. State logic enables users to model the application they are trying to control by using a hierarchy that consists of Tasks, subdivided by States which are described by Statements.

Tasks are a description of a sequential activity of the model. The machines, applications or processes being modelled by state logic will usually contain more than one task , representing several different and possibly parallel activities. Each of these activities will contain a given number of states . As in finite state machine theory, only one state will be active at a time, and certain inputs and outputs will cause the transition between different states.

Given that PLCs usually control systems which are easily represented by a state transition diagram, the use of a very high-level programming language such as state logic greatly helps the PLC programmer in making intuitive control programs.

=See also=

*Very high-level programming language *Programmable logic controller *Digital circuit